problems with 4x4

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Jun 9, 2016 | 10:39 AM

altonlee

Thread Starter

Cross-Country

Joined: Jul 2012

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problems with 4x4

I have a 2004 F350 with 6.0. My problem is the 4x4 will not engage from inside the truck. I have to get out and twist each hub to lock in the 4 wheel drive.
If I rev the engine with high rpms the front will lock in with a big jerk. It use to lock in just by turning switch.

Has anyone ever had this problem? If so what is the best way to fix it?

Thanks
Alton

Jun 9, 2016 | 12:37 PM

WatsonR

Lead Driver

Joined: May 2014

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From: Virginia Beach VA

you have a vacuum leak in one of the hoses feeding the hubs.

Jun 9, 2016 | 09:10 PM

hwybee22

Posting Guru

Joined: Nov 2009

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From: Liberty, NC

Quote:

Originally Posted by WatsonR

you have a vacuum leak in one of the hoses feeding the hubs.

5

I'm agreeing

Jun 10, 2016 | 03:53 AM

TooHuge

Senior User

Joined: Jan 2016

Posts: 380

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Could also have a failed auto hub solenoid. It is located behind the passenger battery. You can test it by engaging the 4x4 and testing the vacuum on the other side of the solenoid. I just replaced mine last week.

Jun 10, 2016 | 04:23 PM

smlford

Fleet Mechanic

Joined: Feb 2007

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From: Mid Atlantic

Look up Diesel Tech Ron on YouTube. He has a video about how to diagnose the problem and how to easily fix it.

Jun 10, 2016 | 04:35 PM

Jmoen7

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Joined: Oct 2012

Posts: 794

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From: Ontario

I would lean closer to having a failed hub seal. Put a vacuum tester on the hub nipple and pressurize (Vacuum) to 15 psi, if it doesn't hold or even get there, your hub seal is gone and no amount of checking the lines will get you anywhere